Bulldozer attachment for tractors



April 24, 1956 Filed Oct. 1, 1952 M. PARKER ETAL BULLDOZER ATTACHMENT FOR TRACTORS 3 Sheets-Sheet 1 We! 9,611 Parke!" OI- LILE, (also/z INVENTORS.

1 1 BY 1 I 1 ATTORNEYS April 24, 1956 M. PARKER EIAL BULLDOZER ATTACHMENT FOR TRACTORS 3 Sheets-Sheet 2 Filed Oct. 1, 1952 INVENTORS.

ATTORNEYS April 24, 1956 M, PAR ER ETAL 2,742,720

BULLDOZER ATTACHMENT FOR TRACTORS Filed Oct. 1, 1952 3 Sheets-Sheet 5 k & \\9 s f' I.

i s '5 1 l 1 LL I? l N i Q [I (er-'- I i 00 q I (Q. I m gk N 1 i i r x X N i i A i 1 H i 1 r JVeluz'n Par/fer H 0/ 0,!10211446150/2 INVENTOR5.

ATTORNEYS 2 42 120 Q nULLDozER ATTACHMENT roam ions 1' Q Melvin Parker, Waldron, Kansa and Orvill E. Wilson,

Manchester, Okla.

Application October 1, 1952, Serial No. 312,436 I 1 Claim. (Cl. 37-144) This invention relates to a bulldozer attachment specially designed for use in connection with tractors of con ventional construction, the primary object of the invention being to provide means for converting the usual tractor into a machine for accomplishing the work of' the usual bulldozer.

An important object of the invention is to provide an attachment which may be readily and easily installed on a tractor, the construction of the attachment being such that the blade may be raised and adjusted for depth of operation, by the fluid mechanism forming a part of the usual tractor.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and 'combinations of parts hereinafter more fully described and pointed out in the claim, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings:

Figure 1 is a bottom plan view of the attachment illustrating the same as connected with the usual front axle of a farm tractor.

Fig. 2 is a side elevational view of the attachment, the tractor axle to which the attachment is connected being shown in section.

Fig. 3 is a longitudinal sectional view through the attachment.

Fig. 4 is a vertical sectional view taken on line 4-4 of Fig. 2.

Fig. 5 is a vertical sectional view taken on line 5-5 of Fig. 1.

Referring to the drawings in detail, the bulldozer attachment forming the subject matter of the present invention, embodies a. pair of bars 5 connected by means of the bar 6, the bars diverging towards their outer ends, where they are formed with parallel supporting sections 7. The reference character 8 indicates a brace bar which connects the bars 5 at points intermediate their ends, the brace bar also providing a support for the cylinder 9 in which the piston rod 10 operates, the piston rod 10 carrying the usual piston not shown.

Welded to the outer surfaces of the parallel supporting sections are the vertical supporting plates 11, which have connection with the forward ends of the parallel supporting sections 7 of the bars 5, at points interme diate the ends of the vertical supporting plates, as shown by Fig. 2 of the drawings.

These supporting plates 11 have bearings 12 arranged adjacent to the upper and lower ends thereof, the bear ings 12 providing supports for the shafts 13 and 14 which are pivotally mounted within the bearings.

Secured to the shafts 13 and 14 are forwardly extended links 15 which links have their forward ends pivotally mounted between spaced plates 16, that are welded to the rear surface of the bulldozer blade 17.

Secured to the shaft 14, at a point intermediate the ends thereof, is'the link 18, which link also extends forwardly and has its forward end pivotally connected to the :bulldozer blade'17, at 19, the forward end of the link, 18 being pivotally connected between the cars 20 that extend rearwardly from the bulldozer blade.

Rising from the link 18 and secured thereto at a point.

intermediate the ends of the link, is the vertical arm 21 to which the inner end of the bar 22 is welded, the connection between the vertical arm 21 and bar 22 being at a point spaced from the inner end of the bar 22, as clearly shown by Fig. 3 of the drawings. The forward end of the bar 22 is welded to the upper forward edge of the link 18. I

The piston rod 10 which is actuated by a piston not shown, which in turn moves in the cylinder 9, has pivotal connection with one end of the bar 22, at 23, so that movement of the piston and rod 10 will operate to raise and lower the bulldozer blade 17.

The cylinder 9 receives air from the fluid power mechanism, forming a part of the conventional tractor. The hose 24 connects with the cylinder 9 at 25, and delivers air to the cylinder at the forward end thereof, while the hose 26 delivers air at the opposite or inner end of the cylinder 9 to move the piston within the cylinder in the opposite direction.

The attachment is mounted on the usual tractor frame by the three-point suspension, which includes the pin 29 that is fitted in an opening of the member that depends from the forward end of the usual draw bar of the tractor, there being provided a securing pin 31 extended through the pin 29, securing the rear end of the attachment to the draw bar and tractor frame.

The forward end of the attachment frame is disposed under the axle of the tractor, the axle of the tractor being indicated by the reference character 32, over which the U-shaped fastening members 33 are positioned, the fastening members 33 being in the form of U-shaped bolts that have their ends passing through openings formed in the parallel supporting sections 7 of the bars 5, as clearly shown by Fig. 3 of the drawings.

Extending from the rear end of the cylinder 9, are spaced ears 34 between which the plate 35 is positioned, the plate 35 and cars 34 having aligning openings to accommodate the pin 36 pivotally connecting the cylinder 9 to the frame of the device. The cotter key 37 passes through one end of the pin 36 holding the pin within the openings of the plate 35 and spaced cars 34.

This plate 35 is welded to the brace bar 8 and extends downwardly therefrom, the location of the plate 35 being intermediate the ends of the brace bar 8.

From the foregoing it will be seen that due to the construction shown and described, I have provided an attachment which may be readily and easily mounted on the usual tractor frame to the end that the operator of the tractor may be operating the conventional hydraulic mechanism of the tractor, accomplish the raising and lowering of the bulldozer blade 17, to adapt it for a particular work.

Having thus described the invention, what is claimed The combination with a tractor having a fluid power lift means including a piston rod, and having a front axle with wheels mounted on the ends thereof, of a bulldozer attachment comprising a frame including a pair of side bars converging rearwardly connected at their rear ends, means for connecting said side bars under the front axle, means for connecting the converged ends of said frame to the underside of the tractor, a wide vertical supporting plate secured to the forward end of each side bar, said supporting plates having upper and lower bearings, horizontal upper and lower shafts having their ends mounted in said bearings with the ends thereof ex- Patented Apr. 24,1956,

tending beyond said supporting plates, a horizontal bulldoze: blade, forwardly extended upper and lower links connected to the extended ends of said shafts, means for pivotally connecting the forward ends of said links to said blade, 21 vertical arm secured to said lower shaft ata point intermediate the ends thereof, a rearwardl'y extended bar pivotally connected to said bulldozer bla'de intermediate the ends of said blade, said vertical arm is moved vertically by said fluid power lifting means..

References Cited in the file of this patent UNITED STATES PATENTS McGe'e' sc-snns July 21, 1-953 

